Singapore has seen a number of victims struck by the latest global ransomware attack, the Cyber Security Agency (CSA) said in an alert yesterday.

Systems at Tiong Bahru Plaza and White Sands were also believed to be affected by the WannaCry worm.

MediaOnline, which supplies digital signage, rushed to fix its systems after 12 kiosks were infected at the malls. Director Dennis So said the systems were not connected to the malls or tenants' networks.

The latest cyber attack, one of the biggest in recent history, has affected more than 200,000 people in 150 countries, said Europol, the European Union's police agency.

It warned that the number will grow when people return to work today. "The global reach is unprecedented," its director Rob Wainwright told Britain's ITV.

Europol thinks the malware began to spread last Friday from Britain's National Health Service.

The CSA advised Internet users to be suspicious of uninvited documents sent through e-mail, back up crucial files and run anti-virus security tools.

Those with infected systems should remove the network cable or shut down the wireless function on their device so that the ransomware does not spread. They can then patch and restore their systems.

Cyber security firm Symantec said affected users should not pay the ransom. "Backing up important data is the single most effective way of combating ransomware infection," it added.

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